Description (CNA)
Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, render_toc_ul() builds a <ul> table-of-contents tree from a list of (level, id, text) tuples. Both the id value (used as href="#<id>") and the text value (used as the visible link label) are inserted into <a> tags via a plain Python format string — with no HTML escaping applied to either value. When heading IDs are derived from user-supplied heading text (the standard use-case for readable slug anchors), an attacker can craft a heading whose text breaks out of the href="#..." attribute context, injecting arbitrary HTML tags including <script> blocks directly into the rendered TOC. This vulnerability is fixed in 3.2.1.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| lepture / mistune | affected < 3.2.1 |
CWE
CWE-79
References
- https://github.com/lepture/mistune/security/advisories/GHSA-6269-cqxg-mhhv
- https://github.com/lepture/mistune/releases/tag/v3.2.1
ADP enrichment
No English description supplied.